Understanding Approval Parameters; Entity Value Calculations; Fiber Optic Interface; United States Approvals - Mettler Toledo IND560x Manual De Instalación

2.2.

Understanding Approval Parameters

2.2.1.

Entity Value Calculations

The power input, analog load cell, IDNet, COM1, discrete inputs, discrete outputs and CL interface
of the IND560x terminal were reviewed for safety using the entity value method of evaluation. The
entity parameters for each of these connections can be found in the last section of this chapter and
also in the approval certificates in Appendix A. Refer to the approval documentation of the peripheral
device to be connected to the IND560x terminal for its entity parameters.
The following conditions must be met.
As an alternative to the direct Inductance calculation, the following inductance to resistance formula
may be substituted:
Where L
cable used.
2.2.2.

Fiber Optic Interface

The fiber optic interface option in the IND560x is approved by limiting the maximum power applied
to the fiber optic cable. The power is restricted by design to 5mW maximum. This restriction is
shown in the approval certificates and control drawings in Appendix A.
2.3.

United States Approvals

This section lists approval details for the IND560x terminal when installed according to United
States requirements. The U.S. safety approvals for the IND560x are based upon entity values and
fiber optic power restriction. The IND560x has been evaluated and approved as:
2-2 METTLER TOLEDO IND560x Installation Manual
Standard
IEC/EN 60079-0 + Electrical apparatus for explosive gas atmospheres – Part 0:
A11 General requirements
Electrical apparatus for potentially explosive atmospheres -
IEC/EN 60079-11
Intrinsic safety "i"
Protection of equipment and transmission systems using optical
IEC/EN 60079-28
radiation
U or V ≥ U or V

i max o oc
I or I ≥ I or I

i max o sc
P ≥ P or P

i o t
C + C ≤ C or C

i cable o a
L + L ≤ L or L

i cable o a
L / R < L / R

a max. a cable cable
is the length-based inductivity value and R
cable
Description
is the length specific resistance of the
cable
Date
2011/2012/2013
2011/2012
2015
64061929 | 11 | 07/2017